The Change of Electrical Resistance of Soil by Freezing

[摘要] The change of electrical resistance with the depression of temperature is obsfrved on several specimens of soil. The sample is contained in a wide glass tube, two concentric copper tubes and a thermometer being inserted in it, and kept in a freezing mixture. The resistance is measured by a D. C. ohm-meter of the type MAI of TSK. The freezing point is estimated dilatometrically on another sample of the same specimen. Some of the specimens show an abrupt increase of resistance upon freezing while the others do not reveal the same tendency. The phenomenon is mainly attributed to the sudden decrease of mobile electrolyte ions upon freezing. The soil which contains much saline matter shows freezing when it is cooled in the dilatometer but the electrical resistance do not change considerably upon freezing. The result can be applied to the estimation of the depth of the soil frozen whithout turning up the ground.

[学科分类] 大气科学